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If you have a PayPal business debit card, you may add it as a payment method at Amazon and use it to pay because Amazon doesn't accept plugging in a PayPal email address to make payment.
The funds will be drawn from your PayPal balance or the linked back up funding source to make your purchase if you don't have enough in the balance and you shouldn't make a habit not having enough in your PayPal balance to cover purchases if at all possible or the card will start declining.